ヘッダー部の属性取得;GetAttributeByName

とりあえずメモ

#include <stdio.h>//printf とかで必要
#include<windows.h>//MessageBox とかで必要

#include <wmsdk.h>
#pragma comment(lib, "wmvcore.lib")

void main(void)
{

 IWMMetadataEditor * pEditor = NULL;
 IWMHeaderInfo * pHeaderInfo = NULL;

 HRESULT hr = S_FALSE;

 hr = WMCreateEditor(&pEditor);

 hr = pEditor->Open(L"G:\\sampleMovie\\sample.wmv");

 pEditor->QueryInterface(IID_IWMHeaderInfo, (void**) &pHeaderInfo);

 WMT_ATTR_DATATYPE attType;
 WORD streamNum = 1;
 WORD cbValue = 0;

 //文字列の適切なサイズを取得
 hr = pHeaderInfo->GetAttributeByName(&streamNum, 
  g_wszDeviceConformanceTemplate, &attType, NULL, &cbValue);

 WCHAR *pbValue = (WCHAR *) new BYTE[ cbValue ];   
 if( ! pbValue )   
 {   
  printf("割り当て失敗\n");
 }   

 hr = pHeaderInfo->GetAttributeByName(&streamNum, 
  g_wszDeviceConformanceTemplate, &attType, (BYTE *) pbValue, &cbValue);

 printf("%S\n",pbValue);//L1と出力

 MessageBox(0,0,TEXT("OK"),0);
}